Baba & Poore 2002 : 241
Munidopsis serricornis
M. treis Ahyong & Poore, 2004
Munidopsis serricornis
New records and new species of the munidopsine squat lobsters (Decapoda: Anomura: Galatheidae: Munidopsinae) from Australia
Taylor, Joanne
Ahyong, Shane T.
Andreakis, Nikos
Zootaxa
2010
2642
1
18
[151,404,554,580]
Malacostraca
Galatheidae
Munidopsis
Animalia
Decapoda
2
3
Arthropoda
species
comarge
sp. nov.
Not Munidopsis serricornis. — Baba & Poore 2002: fig. 6C, 7B, 8B, 9C–D [= M. treis Ahyong & Poore, 2004]. Not Munidopsis serricornis. — Baba & Poore 2002: fig. 6B, 7A, 8A, 9A [= undescribed species (Ahyong in prep.)].
Typematerial. WAMC45481, ovigerous female holotype(cl. 10.6 mm, pcl. 7.4 mm), off Albany, Western Australia, 35°26.05–26.25.00´S, 118°21.00–21.06´E, 900–915 m, sled, (stn SS10/2005/044) (acq. 041), coll. R. Wilson, 25 Nov. 2005. Other material examined. AUSTRALIA, TASMANIA: NMV J58237, 1 damaged male, 1 female(cl. 11.0 mm, pcl. 8.0 mm), south of Tasmania, Cascade 1000 site, 43°51.68–51.03’S, 150°25.72–24.43’E, 800– 1000 m, 9 Apr. 2007(stn SS02/2007/66) (acq. 026); NMV J58234, 1 male(cl. 10.0 mm, pcl. 7.1 mm), 43°49.80–49.46’S, 150°28.45–28.15’E, 835–870 m, 9 Apr. 2007(stn SS02/2007/68) (acq. 004); NMV J58236, 1 male(cl. 6.5 mm, pcl. 4.7 mm), 1 ovigerous female (pcl. 7.3 mm), 2 females(cl. 7.0– 9.7 mm, pcl. 4.9–6.7 mm), Cascade site, 43°55.33–55.70’S, 150°27.91–28.31’E, 590–660 m, 10 Apr. 2007(stn SS02/ 2007/75) (acq. 034); NMV J58235, 1 male(cl. 7.8 mm, pcl. 5.6 mm), 2 ovigerous females (cl. 8.7–9.3 mm, pcl. 6.1–6.7 mm), 43°56.01’S, 150°30.73–31.53’E, 780–870 m, 8 Apr. 2007(stn SS02/2007/61) (acq. 034); NMV J58238, 2 ovigerous females (cl. 8.2–8.9 mm, pcl. 5.7–6.3 mm), 43°55.40–55.78’S, 150°27.88– 28.35’E, 590–660 m, 10 Apr. 2007(stn SS02/2007/77) (acq. 050). AUSTRALIA, VICTORIA: NMV J17100, 1 sex indet (cl. 4.9 mm, pcl 3.3 mm), South of Point Hicks, 38°21.90’S, 149°20.00’E, 1000 m, 23 Jul 1986, (stn SLOPE32). NEW ZEALAND, CHATHAM RISE: NIWA53646, 4 males(cl. 7.7–10.4 mm, pcl. 5.5–6.9 mm), 5 females(cl. 9.4–10.1 mm, pcl. 6.5–7.5 mm), Diamond Head C Seamount, 44°08.82–08.79’S, 174°41.87– 42.10’W, 720–780 m, 26 June 2009(stn TAN0905/98); NIWA54360, 4 males(cl. 8.6–10.7 mm, pcl. 6.2–7.6 mm, 1 ovigerous female cl 9.2 mm, pcl 6.5 mm, 1 femalecl 10.7 mm, pcl. 7.6 mm), 44°01.67–01.87’S, 174°35.46–35.44’W, 801–823 m, 28 June 2009(stn TAN0905/121); NIWA53683, 4 males(cl. 10.7–14.1 mm, pcl. 7.5–10.3 mm), 6 ovigerous females (cl. 10.6–11.9 mm, pcl. 7.4–8.2 mm), 5 females(cl. 7.2–12.0 mm, pcl. 4.9–8.4 mm), 44°08.38–08.54’S, 174°43.18–43.56’W, 641–758 m, 26 June 2009(stn TAN0905/99); NIWA54019, 3 males(cl. 7.6–13.2 mm, pcl. 5.4–9.4 mm), 2 females(cl. 12.4 mm, pcl. 8.8 mm), 1 damaged (pcl. 8.2 mm), 44°08.87–08.82’S, 174°43.49–43.52’W, 760–821 m, 27 June 2009(stn TAN0905/112); NIWA53962, 1 male(cl. 8.0 mm, pcl. 5.7 mm), 44°08.85–09.00’S, 174°41.45–41.64’W, 458–648 m, 27 June 2009(stn TAN0905/111); NIWA54088, 1 ovigerous female (cl. 9.7 mm, pcl. 7.1 mm), 44°08.97–09.02’S, 174°45.41–45.63’W, 519–609 m, 27 June 2009(stn TAN0905/113); NIWA53792, 1 male(pcl. ~ 7.9 mm), 44°09.49–09.44’S, 174°33.69–33.91’W, 681–913 m, 26 June 2009(stn TAN0905/104); NIWA54164, 3 males(cl. 8.2–13.4 mm, pcl. 5.5–9.4 mm), 1 ovigerous female (cl. 10.6 mm, pcl. 7.6 mm), 1 female(cl. 7.1 mm, pcl. 5.0 mm), 44°10.50–10.39’S, 174°33.13–33.36’W, 716–745 m, 27 June 2009(stn TAN0905/116); NIWA53882, 1 male(cl. 9.2 mm, pcl. 6.5 mm), 3 ovigerous females (cl. 10.1–11.7 mm, pcl. 7.0–8.0 mm), 2 females(cl. 10.6–10.8 mm, pcl. 7.5–7.8 mm), 44°10.50–10.68’S, 174°33.18–33.40’W, 704–709 m, 26 June 2009(stn TAN0905/106); NIWAex53916, 1 damaged male, Ritchie Seamount, with sponge, 44°10.61’S, 174°33.56’W, 760–960 m, 26 June 2009(stn TAN0905/107); NIWA67822, 1 male(cl. 9.5 mm, pcl. 6.7 mm) (stn TAN0905/97). NEW ZEALAND, SNARES ISLANDS: NIWA67821, 1 male(cl. 13.4 mm, pcl. 9.5 mm), 48°02.01’S, 166°06.01’E, 935 m, 25 Nov. 1998( TRIP 1171/ 12, Z9583, J. Wills).
Description. Carapace: Moderately convex from side to side; widest near anterior third; sparsely covered with low granules or short striae, glabrous or with minute setae; cervical groove indistinct; with transverse row of epigastric scales on either side of midline, one or more scales occasionally with minute median point. Posterior orbital margins transverse to slightly oblique, outer orbital spine small, acute. Frontal margins concave, oblique; anterolateral spine similar to outer orbital spine. Lateral margins broadly convex, unarmed, with small notch at junction of anterior and posterior branchial regions. Rostrum broad, 0.38–0.48 remaining carapace length; distally trifid; apex slightly inclined dorsally; bluntly carinate dorsally; lateral margin convex. Posterior margin unarmed. Pterygostomian flap with short diagonal striae and small granules; anterior margin blunt, angular. Sternum: Sternum longer than wide, triangular. Sternite 3 about one-third width of sternite 4, anterior margin crenulated, irregular; posterior margin of sternite 3 medially contiguous with anterior margin of sternite 4. Sternites smooth, unarmed. Abdomen: Tergites with short, fine, scattered setae, without spines. Tergites 2–4 with elevated anterior ridge; tergites 2 and 3 also with shallow groove behind anterior ridge. Tergite 6 posterior margin not strongly produced. Telson composed of 8 plates. Uropodal endopod lateral margins setose, unarmed. Eye: Ocular peduncle unarmed, dorsally setose; movable; partially concealed by rostrum. Cornea subglobular, as wide as peduncle. Small slender spine adjacent to lateral margin of eye. Antennule: Basal article squat, with 2 distolateral spines, ventral slightly larger than dorsal; distomesial margin with short triangular tooth. Antenna: Basal article with blunt, triangular mesial and lateral tooth, neither overreaching article 2. Article 2 with strong distolateral spine, reaching midlength of article 3. Articles 3 and 4 unarmed. Maxilliped 3: Dactylus and propodus unarmed. Carpus extensor margin dentate. Merus extensor margin with distal spine; flexor margin with 2 large triangular spines proximally and 1 or 2 smaller spines distally. Ischium longer than wide, with distal flexor and extensor spine. Pereopod 1 (cheliped): Elongate, 2.1–3.0 times carapace length; with scattered setae, most numerous on dorsal and ventral margins. Ischium with dorsal spine. Merus with 4 distal spines: dorsal, ventral, lateral and mesial; small dorsal spine near midlength, in line with distal dorsal spine; proximal mesial margin with 0–4 spines, in line with mesial distal spine (0–2, usually 1, in Australian specimens; 1–4, usually 2 or 3 in New Zealandspecimens). Carpus about 1.7 times as long as high; outer surface with distal and subdistal spine (latter largest) on upper margin, and single spine near lower margin. Propodus unarmed, palm about 2.5 times as long as high; dorsal margin of palm longer than dactylus. Pollex and dactylus occlusal margins crenulated, apices with interlocking teeth. Pereopods 2–4 (walking legs): Slightly compressed; decreasing in length posteriorly; with scattered, sparsely setose striae. Pereopod 2 not reaching cheliped carpus. Merus extensor margin with slender distal spine, otherwise unarmed; flexor margin with triangular distal spine, otherwise unarmed. Carpus with distal extensor spine and irregular or serrated (but not spinular) margin; with low, irregular, lateral carinae. Propodus extensor margin unarmed; flexor margin with movable spine at distal third and paired movable spines distally adjacent to dactylar articulation. Dactylus about two-thirds propodus length; extensor margin unarmed, with scattered setae; flexor margin with 8–11 corneous spines and with more slender movable spine at base of corneous unguis. Epipods:Pereopods 1–4 without epipod. Egg diameter: 1.2–1.4 mm.
Etymology.From the acronym for the Census of Marine life Project Continental Margin Ecosystems( COMARGE), in recognition of funding provided for the first author’s postdoctoral fellowship; used as a noun in aposition. FIGURE 1. Munidopsis comarge sp. nov., holotype, female (cl 10.6 mm, pcl 7.4 mm), WAM C45481. A, carapace and abdomen, dorsal view. B, carapace and abdomen, right lateral view. C, right antenna and antennules, ventral view. D, right basal antennular segment, lateral view. E, right maxilliped 3. F, right maxilliped 3 crista dentata. G, left cheliped. H, finger tips, inner surface. I, left cheliped merus and carpus, ventral view. J, left cheliped merus and carpus, dorsal view. K–M, left pereopods 2–4. N, sternal plastron. O, telson. Scale: A, B, G–M, O = 2.0 mm; C–F, N = 1.0 mm. Colour in life.Not known.
Remarks. Munidopsis comarge sp. nov.closely resembles M. ternariaMacpherson, 2007, from New Caledoniain the combination of the broad, flattened, trifid rostrum; unarmed lateral margins of the carapace (excluding the anterolateral spine); presence of a small outerorbital spine; and absence of pereopodal epipods. The two species differ in the following features: the epigastric region in M. comarge sp. nov.bears a transverse row of scales on either side of the midline, rather than a pair of small epigastric spines in M. ternaria; the width of thoracic sternite 3 is about one-third rather than one-quarter the width of sternite 4; the dactyli of the walking legs bear a slender corneous spine at the base of the unguis (absent in M. ternaria) and the sternal plastron of M. comarge sp. nov.is more triangular in shape, with the broad outline of the lateral margins strongly divergent rather than almost subparallel. The material assigned to M. comarge sp. nov.ranges from southeastern New Zealandto Victoria, Tasmania and Western Australia, though no specimens are presently known from localities between Tasmania and Western Australia. The specimens agree closely in most respects, but the southeastern Australian and New Zealandspecimens differ from the Western Australian holotypein having more spinose chelipeds. The specimens from Australiaand New Zealandagree well, but differ in the following respects: 1) the inner proximal margin of the cheliped merus is less spinose in the Australian specimens, with 0–2 spines (usually 1), rather than 2–4 (usually 2 or 3), 2) the epigastric scales are sometimes more acutely produced in the New Zealandmaterial, and 3), the carapace of Australian specimens is generally widest anterior to the midlength, rather than at or behind the midlength as in most New Zealandspecimens. The significance of these differences is difficult to evaluate at present; they are treated here as intraspecific variation, but may prove to be more significant when more material becomes available for study. Thus, the typematerial is restricted to the holotypefrom Western Australia. The known distribution of M. comarge sp. nov.parallels that of the brachyuran crab, Neopilumnoplax nieliAhyong, 2008, and the lithodid crab, Paralomis pooreiAhyong, 2010, which are known from New Zealand, southeastern Australiaand southwestern Australia, with no records from the Great Australian Bight (Ahyong 2008). Asnoted by Ahyong & Poore (2004) and Macpherson (2007), previous records of M. serricornisLovén, 1852, from the southwestern Pacific are referrable to other species. Records of M. serricornisby Baba & Poore (2002) are based on M. comarge sp. nov., M. treisAhyong & Poore, 2004, and a M. serricornis-like species currently under study by STA, and referred to as M.cf. serricornisin the key below. Similarly, specimens tentatively identified as M. serricornisfrom Tasmania by Ahyong & Poore (2004) are also referrable to M. cf. serricornis.
Distribution.Southwestern Australia, southeastern Australia, and southeastern New Zealand; 458–1000 m.