Gonodactylopsis lata, Ahyong, 2022

Ahyong, Shane T., 2022, Revision of the Indo-West Pacific Coral Reef Mantis Shrimp Genus, Gonodactylopsis Manning, 1969 (Crustacea: Stomatopoda: Gonodactylidae), Records of the Australian Museum 74 (2), pp. 41-57 : 51-54

Gonodactylopsis lata sp. nov.

urn:lsid:zoobank.org:act:7BCC7B2E-45E8-448F-9EDF-1D329F4B6EF1

Figs 1, 6–8

Holotype: USNM 307139 , female (TL 22 mm), S of passage, W side Totoya Island , Fiji, 18°58'57"S 179°52'12"E, 13.5 m, barrier reef, with cuts & caves, rubble, VGS 82-9, V. Springer et al., 27 April 1982 . Paratypes: USNM 307184 , 1 female (TL 19 mm), Yasawa Group , Fiji, 16°43.2'S 177°34.8'E, 10.7 m, WE 83-67, poison, A. Emery et al., 28April 1983 ; MNHN IU-2021- 3553 , 9 males (15–19 mm), 4 females (18–21 mm), S of Viti Levu , Fiji, 18°11.9'S 178°34.5'E, 80–86 m, MUSORSTOM 10 stn CP1364, 15 August 1998 ; MNHN IU-2021-3553 , 2 females (16–19 mm), Rewa roads, Viti Levu, 18°12'S 178°35'E, 100–122 m, SUVA 4 stn 04, 23 September 1999 .

Other material examined. Papua New Guinea, New Ireland, Kavieng: MNHN IU-2014-187 , 1 female (TL 15 mm), E of North Cape , 2°33.2'S 150°48.2'E, 13 m, bottom of reef slope, KAVIENG 2014 stn KB08, 5 June 2014 ; MNHN IU-2014-213 , 1 female (TL 21 mm), E of North Cape , 2°33.2'S 150°48.2'E, 13 m, bottom of reef slope, KAVIENG 2014 stn KB08, 5 June 2014 ; AM P105858 , 1 male (TL 16 mm), E of North Cape , 2°33.5'S 150°48.8'E, 19 m, rubble on sand, KAVIENG 2014 stn KB64, 24 June 2014 ; MNHN IU-2014-965 , 1 female (TL 13 mm), E of North Cape , 2°33.5'S 150°48.8'E, 19 m, rubble on sand, KAVIENG 2014 stn KB64, 24 June 2014 ; MNHN IU-2014-966 , 1 male (TL 10 mm), E of North Cape , 2°33.5'S 150°48.8'E, 19 m, rubble on sand, KAVIENG 2014 stn KB64, 24 June 2014 ; MNHN IU-2014-967 , 1 male (TL 13 mm), 1 female (TL 9 mm), E of North Cape , 2°33.5'S 150°48.8'E, 19 m, rubble on sand, KAVIENG 2014 stn KB64, 24 June 2014 ; MNHN IU- 2014-1008 , 1 male (TL 15 mm), E of North Cape , 2°35.2'S 150°50.3'E, 17 m, sand and rubble, KAVIENG 2014 stn KB66, 24 June 2014 .

Description. Eyes elongate; cornea subconical, reaching anteriorly almost to end of antennular article 3. Ocular scales low, subtruncate.

Antennular peduncle length 0.5–0.7CL. Antennal protopod with fixed, laterally flattened mesiodorsal spine, short anteroventral tooth; antennal scale length 0.3–0.4CL.

Rostral plate slightly wider than long; median spine twice length or less of basal portion (medially), laterally compressed, with obtusely angular ventral keel; lateral spines divergent with arcuate to almost straight margins.

Raptorial claw dactylus with proximal notch on outer margin; propodus with proximal movable spine, opposable margin sparsely pectinate proximally.

Mandibular palp 2- or 3-segmented. Maxillipeds 1–5 each with epipod.

Thoracic somites 6 lateral process slightly wider than that of somite 7, both with lower margins subtruncate. Thoracic somite 8 anterolateral margin rounded; sternal keel obsolete.

Pleopod 1 endopod with lateral lobe on posterior “endite”.

Abdominal somites 1–5 posterolateral angles unarmed. AWCLI 762–839. Abdominal somite 6 with submedian, intermediate and lateral bosses usually posteriorly armed, intermediates sometines posteriorly blunt.

Telson wider than long; 9–14 submedian denticles, arising from inner margin in juveniles, migrating dorsally in adults; 2 intermediate usually evident, lateral denticles absent; submedian, intermediate and lateral teeth lamellate, blunt; submedian teeth subparallel; intermediate teeth longer than wide, extending posteriorly slightly beyond midlength of submedian teeth; lateral teeth stout, lamellar, apex rounded to bluntly angular, directed posteriorly. Median carina weakly inflated in females, tumid in males, with 1 posterior spine; accessory median with 1–3 (usually 3) spines; anterior submedian carina composed of 1–4 (usually 2) spines in longitudinal row or cluster; submedian tooth with 1 (rarely 2) dorsal spines basally; anterior intermediate carina composed of 1–4 (usually 2) spines; intermediate tooth with 1 or 2 (usually 2) dorsal spines basally; knob absent; submedian and intermediate teeth without ventral carina.

Uropodal protopod terminal spines with outer slightly longer than inner, each with ventral carina, inner with dorsal carina; upper proximal surface with obtuse swelling behind cristate dorsal carina in specimens> TL 20 mm; slender spine above exopod articulation. Exopod proximal article dorsal surface with sharp, curved carina, distally flanked on either side two short subequal carinae, proximally flanked mesially with 0–2 small spines; outer margin with 9–12 movable spines, distalmost reaching distal one-third of distal article; inner margin smooth, glabrous; distal margin with small ventral spine. Exopod distal article with outer distal margin setose, inner margin glabrous; dorsal and ventral surfaces with inner half dorsal membranous, soft, wrinkled, clearly demarcated from chitinized outer portion; outer chitinized portion with prominent, curved carina dorsally, ventrally with longitudinal carina. Endopod length 2.5–3.2× width, crescentic, articulation with protopod posterior to anterior end; outer margin strongly convex, setose along distal half, inner margin strongly, irregularly concave, glabrous; dorsally with sharp, cristate, curved carina adjacent to outer margin; dorsal and ventral surfaces with inner dorsal half membranous, soft, wrinkled, clearly demarcated from chitinized outer half.

Colour in life. ( Fig. 8 ) Overall translucent with light green and white mottling or speckling and scattered black-brown and orange chromatophores; with 2 narrow, irregular, with white transverse bands, one across carapace at position of cervical groove, and a second across posterior quarter of abdominal somite 6, continuing onto uropodal protopod and anterior half of telson. Rostral plate with white spines, median with red apex. Carapace with white transverse band followed by irregular green patch with pair of small iridescent blue spots and scattered black chromatophores. Iridescent blue spot medially on thoracic somite 6 and abdominal somites 1, 3, 4, somite 1 also with rectangular green and black speckled patch; 3 blue iridescent spots in transverse row on abdominal somite 5. Pair of dark spots across anterior margin of telson. Antennae and antennules transparent with few scattered white and dark spots. Raptorial claw dactylus white, propodus translucent with small distal orange-brown spot at dactyl articulation; carpus and merus translucent with scattered white speckling or mottling; meral spot colourless. Pereopods 1–3 transparent with pale articulations. Uropodal protopod white proximally; primary spines transparent proximally, white with few scattered orange-brown spots distally; exopod proximal article transparent with pale orange-brown highlights; exopod distal article diffuse white; endopod white with irregular patch clear at outer midlength, marginal setae clear.

Measurements. Male (n = 13) TL 10–20 mm; female (n = 12) TL 9–22 mm. Other measurements of holotype: CL 5.3 mm, antennular peduncle length 2.5 mm, antennal scale length 1.9 mm, abdominal somite 5 width 4.0 mm.

Etymology. Named lata, Latin for wide, alluding to the comparatively broad submedian and intermediate teeth of the telson.

Remarks. Gonodactylopsis lata sp. nov. is unique in the genus for the broad, lamellate, distally rounded intermediate and lateral teeth and dorsally placed submedian denticles of the telson in adults. In other species of the genus, the intermediate and lateral telson teeth are distally pointed or angular rather than rounded and marginally lamellate. The submedian denticles of the telson line the mesial margins of the submedian telson teeth in G. drepanophora , G. maqqaba and G. komodoensis ( Figs 3E,G , 4F,J,K , 5H,K,M,N , 9H,L ) or are absent, as in G. herdmani ( Fig. 2H,K ). In G. lata , the submedian denticles are present along the mesial margins of the submedian telson teeth in juveniles but migrate mesiodorsally with increasing body size ( Figs 6H,K , 7 , 8 ).

Gonodactylopsis lata most closely resembles G. drepanophora and G. maqqaba , sharing similar mid-dorsal telson ornamentation composed of multiple prominent conical spines.Apart from the lamellate primary telson teeth and dorsally placed submedian denticles, G. lata is further distinguished from G. drepanophora and G. maqqaba in lacking the longitudinal carina on the ventral surface of the submedian and intermediate telson teeth. Gonodactylopsis lata and G. drepanophora further differ from G. maqqaba in the strongly crescentic rather than linear shape of the uropodal endopod.

The primary variation observed in G. lata is allometric change in increasing prominence of the telson primary teeth and dorsal ornamentation, namely the increasing density and prominence of dorsal spination, the increasingly lamellate primary teeth, migration of the submedian denticles from marginal to dorsal position ( Figs 6H,K , 7 , 8 ), as well as more pronounced curvature of the uropodal endopod. The main structures of the petasma are developed in all of the males examined, although the lateral lobe of the posterior “endite” is rudimentary in the smallest male examined (TL 10 mm, MNHN IU-2014-966), but fully developed by TL 13 mm (MNHN IU-2014-967). The mandibular palp is 2- or 3-articled; two articles are evident in smaller specimens, with the third article typically becoming differentiated by TL 15–21 mm. The dorsal tubercle on the uropodal protopod becomes evident in specimens above about TL 20 mm.

Small specimens of G. lata in which the submedian telson denticles are yet to reach dorsal position may superficially resemble G. drepanophora and G. maqqaba . Nevertheless, at any given size, the intermediate and lateral telson teeth of G. lata ( Figs 6H,K , 7 , 8 ) are proportionally wider and blunter than in G. drepanophora ( Figs 3E,G,I , 4F,J,K ) and G. maqqaba ( Fig. 9H,L ); the new species can also be distinguished from G. drepanophora and G. maqqaba by the absence of the longitudinal carina on the ventral surface of the submedian and intermediate telson teeth, present as a long, well defined ridge in the latter two species ( Figs 3G , 4J , 9L ).

Distribution. Southwestern Pacific, from Fiji and Papua New Guinea; 10.7– 122 m.

Figures

Figure 2. Gonodactylopsis herdmani (Tattersall, 1906): A–K, lectotype female, TL 26 mm, Ceylon, NHM 1906.10.27.1; L, paralectotype female, TL 28 mm, Ceylon, NHM 1906.10.27.1. (A) anterior cephalothorax, dorsal view; (B) right eye, lateral view; (C) ocular scales; (D) rostral plate, lateral view; (E) right antenna, lateral view; (F) right raptorial claw, lateral view; (G) thoracic somites 6–8, right lateral view; (H) abdominal somite 5 and 6, telson and left uropod; (I) abdominal somites 5, 6 and telson, lateral view; (J) right uropod, ventral view; (K) telson, ventral view; (L) telson, dorsal view. Scale = 2.0 mm.

Figure 3. Gonodactylopsis drepanophora (De Man, 1902): A–H, holotype female, TL 19 mm, Ternate, Indonesia, SMF 5773; I–J, male, TL 12 mm, E Ashmore Reef, WAM C54274. (A) anterior cephalothorax, dorsal view; (B) ocular scales; (C) right antenna, lateral view; (D) right raptorial claw, lateral view; (E, I) abdominal somite 6, telson and right uropod; (F) telson, lateral view; (G) telson submedian and intermediate teeth, ventral view; (H) right uropod, ventral view; (J) right pleopod 1 endopod, anterior view. Scale: A–H = 1.0 mm, I = 0.8 mm, J = 0.4 mm.

Figure 4. Gonodactylopsis drepanophora (De Man, 1902): A–J, female, TL 22 mm, Okinawa, Japan, USNM 307225; K, female, TL 18 mm, Ambon, Indonesia, USNM 155707. (A) anterior cephalothorax, dorsal view; (B) ocular scales; (C) right antenna, lateral view; (D) right raptorial claw, lateral view; (E) thoracic somites 6–8, lower right lateral view; (F) abdominal somite 6, telson and right uropod; (G) abdominal somites 4 and 5 posterolateral margin, lateral view; (H) right uropod, ventral view; (I) telson, right lateral view; (J) telson, ventral view; (K) telson, dorsal view. Scale = 1.0 mm.

Figure 5. Gonodactylopsis komodoensis sp. nov.: A–L, male, TL 16 mm, Bunaken, Indonesia,AM P105857; M, male, TL 11 mm, Siladen Island, Indonesia, AM P105856; N, holotype female, TL 22 mm, Komodo, Indonesia, USNM 260914. (A) anterior cephalothorax, dorsal view; (B) right eye, lateral view; (C) ocular scales; (D) rostral plate, lateral view; (E) right antenna, lateral view; (F) right raptorial claw, lateral view; (G) thoracic somites 6–8, right lateral view; (H) abdominal somite 6, telson and right uropod; (I) abdominal somites 5, 6 and telson, lateral view; (J) right uropod, ventral view; (K) telson, ventral view; (L) right pleopod 1 endopod, anterior view; (M, N) telson, dorsal outline. Scale: A–K, M, N = 2.0 mm; L = 1.0 mm.

Figure 6. Gonodactylopsis lata sp. nov.: A–J, holotype female, TL 22 mm, Fiji, VGS 82-9, USNM 307139; K–L, paratype male, TL 17 mm, Fiji, MUSORSTOM 10 CP1364, MNHN. (A) anterior cephalothorax, dorsal view; (B) right eye, lateral view; (C) ocular scales; (D) rostral plate, lateral view; (E) right antenna, lateral view; (F) right raptorial claw, lateral view; (G) thoracic somites 6–8, right lateral view; (H) abdominal somites 5 and 6, telson and right uropod; (I) abdominal somites 5, 6 and telson, lateral view; (J) right uropod, ventral view; (K) telson, dorsal view; (L) right pleopod 1 endopod, anterior view. Scale: A–K = 2.0 mm; L = 1.0 mm.

Figure 7. Gonodactylopsis lata sp. nov., telson outline, Papua New Guinea: (A) male, TL 10 mm, MNHN IU-2014-966; (B) female, TL 13 mm, MNHN IU-2014-965; (C) female, TL 15 mm, MNHN IU-2014-187; (D) male, TL 16 mm, AM P105858. Scale = 1.0 mm.

Figure 8. Gonodactylopsis lata sp. nov., colour in life, female, TL 21 mm, Papua New Guinea, MNHN IU-2014-213. Photo: T.-Y. Chan.

Figure 9. Gonodactylopsis maqqaba sp. nov., holotype female, TL 16 mm, Macclesfield Bank, NTOU S00036.(A) anterior cephalothorax, dorsal view; (B) right eye, lateral view; (C) ocular scales; (D) rostral plate, lateral view; (E) right antenna, lateral view; (F) right raptorial claw, lateral view; (G) thoracic somites 6–8, right lateral view; (H) abdominal somite 6, telson and right uropod; (I) abdominal somites 5, 6 and telson, lateral view; (J) abdominal somites 4 and 5 posterolateral margin, lateral view; (K) right uropod, ventral view; (L) telson, ventral view. Scale = 1.0 mm.