Munidopsis carinipes Faxon, 1893

Rodríguez-Flores, Paula C., Seid, Charlotte A., Rouse, Greg W. & Giribet, Gonzalo, 2023, Cosmopolitan abyssal lineages? A systematic study of East Pacific deep-sea squat lobsters (Decapoda: Galatheoidea: Munidopsidae), Invertebrate Systematics 37 (1), pp. 14-60 : 28-29

Munidopsis carinipes Faxon, 1893

( Fig. 8 a–g , Supplementary Fig. S2 .)

Material examined

Lectotype. PANAMA: Gulf of Panama, Azuero Peninsula , Morro de Puercos , leg. USFC Steamer Albatross, Stn 3353, 23.ii.1891, 7.10416°N, 80.56666°W, 695 fms (1271 m): 1 M 10.1 mm ( MCZ IZ CRU-4561 ).

Paralectotype. Same collecting data as lectotype: 1 M 6.1 mm, 1 ov. F 8.2 mm ( MCZ IZ-163058 ).

Non-type specimens. COSTA RICA: Jaco Scar, leg. Elena Perez, Jake Bailey, R/V Atlantis, HOV Alvin dive 4509, 3.iii.2009, 9.1172°N, 84.8425°W, 1459 m: 1 M 10.5 mm (SIO-BIC C11150). — COSTA RICA: Mound 11, leg. Victoria Orphan, Hang Yu, R/V Atlantis, HOV Alvin dive 4988, naturally occurring wood fall, 3.xi.2018, 8.92208°N, 84.30446°W, 1010 m: 1 M 9.9 mm (SIO-BIC C13869). — COSTA RICA: Mound 12, leg. Greg Rouse, Allison Miller, R/V Falkor, ROV SuBastian dive S0215 B3-7, 8.i.2019, 8.93313°N, 84.30750°W, 1011 m: 1 ov. F 10.0 mm (SIO-BIC C13916).

Diagnosis

Carapace dorsally smooth, porose, laterally unarmed, with deep dorsal furrows, cervical grooves indistinct. Rostrum broadly triangular, lateral margins subparallel, unarmed. Frontal margins slightly oblique, slightly concave behind ocular peduncle. Orbit not distinctly excavated, outer orbital angle blunt. Anterolateral angle unarmed. Branchial margin unarmed. Abdominal somites with transverse ridge, somites 3–5 armed with a broad spine. Telson divided into 9 plates. Sternite 3 moderately broad, anterolateral angles produced, sternite 4 subtriangular. Eyes unarmed, movable, epistomial spine absent. Article 1 of antennule with well-developed dorsolateral and distolateral spines. Article 1 of antenna with distomesial spine. Mxp3 merus subrhomboidal in lateral view. P1 slender, elongate, unarmed, fixed finger without denticulate carina on distolateral margin. P2–4 stout, unarmed; meri strongly carinated, with a ridge in extensor and flexor margin; dactyli moderately slender, curving, flexor margin with cuticular teeth along all margin decreasing proximally. Epipods absent from all pereopods.

Eggs

Approximately 20–35 eggs, 1 mm in diameter.

Colouration

Body and pereopods whitish, with light orange eyes.

Distribution

East Pacific, Panama and Costa Rica from 915- to 1459-m depth.

Genetic data

COI, 16S rRNA and 28S rRNA.

Remarks

Munidopsis carinipes belongs to a group of species sharing a frontal margin without a delimited orbit, telson with 9–10 plates, eye movable, unarmed, with peduncle longer than cornea, and epipods absent from all pereopods. The closest species is M. quadrata Faxon, 1893 from the Northeast Pacific. See the differences in the Remarks of that species.

Figures

Fig. 8. (a–g) Line diagrams of Munidopsis carinipes Faxon, 1893, M 10.09 mm, lectotype (MCZ IZ CRU-4561), Panama. (h–n) Line diagrams of Munidopsis quadrata Faxon, 1893 M 9.8 mm, lectotype (MCZ IZ CRU-4560), Mexico. (a, g) Carapace and abdomen, dorsal view. (b, i) Cephalic region, showing antennular and antennal peduncles, ventral view. (c, j) P1, dorsal view. (d, k) Left P2, lateral view. (e, l) Left P3, lateral view. (f, m) Left P4, lateral view. (g, n) Left P2 dactyl. Scale bars: 1 mm.

Fig. 2. Phylogenetic hypotheses based on the COI data alone resulting from the Bayesian analysis, with results from the species delimitation analyses (ASAP, ABGD, bPTP, GMYC); a grey box indicates that the specimens are not part of the species hypothesis of the black bar. Tip labels in bold indicate new taxa. Colours indicate geographic distribution as specified on the map. Gradients of depth and habitat are also indicated. Asterisks indicate supported nodes: ML bootstrap support>70%/Bayesian posterior probability>0.95.