Cosmopolitan abyssal lineages? A systematic study of East Pacific deep-sea squat lobsters (Decapoda: Galatheoidea: Munidopsidae) Author Rodríguez-Flores, Paula C. Department of Organismic and Evolutionary Biology, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. paularodriguezflores@g.harvard.edu Author Seid, Charlotte A. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. Author Rouse, Greg W. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. Author Giribet, Gonzalo Department of Organismic and Evolutionary Biology, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. text Invertebrate Systematics 2023 2023-01-11 37 1 14 60 http://dx.doi.org/10.1071/is22030 journal article 10.1071/is22030 83c35eac-4bc8-40c5-a8f0-a19ef107d792 7534735 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). 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. 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.