Munida hoda, Macpherson & Rodríguez-Flores & Machordom, 2017

Macpherson, Enrique, Rodríguez-Flores, Paula C. & Machordom, Annie, 2017, New sibling species and new occurrences of squat lobsters (Crustacea, Decapoda) from the western Indian Ocean, European Journal of Taxonomy 343, pp. 1-61 : 15-18

Munida hoda sp. nov.

urn:lsid:zoobank.org:act:615627E4-CB69-45FA-AF2F-E0DECE77E2A4

Figs 5 , 11D

Etymology

From the Greek, hodos, way, in relation to the Mozambique Channel.

Type material

Holotype

MOZAMBIQUE: ♂, 5.3 mm, MAINBAZA, Stn CC3172, 25°58.86′ S, 34°36.51′ E, 630–638 m, 16 Apr. 2009 ( MNHN-IU-2014-13479 ).

Paratypes MOZAMBIQUE: 1 ♀, 17.6 mm, MAINBAZA, Stn CP3141, 23°31.95′ S, 035°55.74′ E, 684–698 m,

11 Apr. 2009 (MNHN-IU- 2008 -10213); 1 ov. ♀, 11.4 mm, MAINBAZA, Stn CC 3166, 24°21.22′ S, 35°42.35′ E, 708–715 m, 15 Apr. 2009 (MNHN-IU- 2008 -10216); 1 ♂, 4.4 mm, 4 ♀♀, 3.5–5.6 mm,

same data as for holotype (MNHN-IU- 2014 -13505).

Description

CARAPACE. 1.3 times as long as broad, with few secondary striae between main transverse ridges. Dorsal ridges with some very short non-iridescent setae and few scattered long iridescent and non-plumose setae. Gastric region with 4 pairs of epigastric spines, longest pair behind supraocular spines. One parahepatic and one postcervical spine on each side. Frontal margins slightly oblique. Lateral margins slightly convergent posteriorly. First lateral spine at anterolateral angle, moderately long, not reaching level of sinus between rostrum and supraocular spines; one small spine in front of anterior branch of cervical groove. Branchial margins with five spines. Rostrum spiniform, about 0.6 times length of remaining carapace, horizontal. Supraocular spines barely reaching midlength of rostrum and not reaching end of corneae, slightly convergent, directed slightly upwards.

STERNUM. Surface of thoracic sternites smooth; sternite 4 with narrow anterior margin.

ABDOMEN. Anterior ridge of somite 2 with 8 spines; somites 2–3 each with uninterrupted transverse ridge on tergite behind anterior ridge; somites 4–5 smooth; posteromedian margin of somite 6 straight.

EYES. Ocular peduncles as long as broad, maximum corneal diameter 0.5 distance between bases of anterolateral spines.

ANTENNULE. Article 1 with 2 well-developed distal spines, distomesial shorter than distolateral spine; two lateral spines, distal much longer than proximal and not exceeding distomesial spine.

ANTENNA. Article 1 with strong distomesial spine not reaching distal margin of article 2. Article 2 with distomesial spine exceeding article 3; distolateral spine reaching midlength of article 3. Article 3 unarmed.

MXP3. Ischium with small spine on fleXor distal margin. Merus shorter than ischium; fleXor margin with 2 spines, proximal stronger than distal; extensor margin unarmed. Carpus unarmed.

P1. 2.6 times carapace length, with numerous long iridescent and plumose setae along mesial margins of articles. Merus 1.1 length of carapace, 2.7 times as long as carpus, with some dorsal spines; distal spines strong, distomesial spine not reaching midlength of carpus. Carpus 0.7 length of palm, 2.3 times as long as broad, with spines along mesial and dorsal sides. Palm 3.3 times as long as broad, with row of small dorsal spines; one row of spines along mesial and lateral margins. Fingers as long as palm; fiXed finger with row of 3–4 spines along lateral margin; movable finger with row of 5–7 spines along mesial border.

P2–4. Long and slender, with some plumose setae and few long iridiscent setae along extensor margin of articles. P2 2.4 times carapace length. Meri shorter posteriorly (P3 merus 0.8 length of P2 merus, P4 merus 0.6 length of P3 merus); P2 merus as long as carapace, 9.5 times as long as broad, 1.6 times as long as P2 propodus; P3 merus 7.5 times as long as broad, 1.4 times as long as P3 propodus; P4 merus 4.3 times as long as broad, 1.2 times length of P4 propodus. Extensor margins of P2 merus with row of 8 proXimally diminishing spines, 5 spines on P3 merus and unarmed on P4; fleXor margins distally with some spines followed proximally by several eminences; lateral sides unarmed. Carpi with 2–3 spines on extensor margin of P2–3, unarmed on P4; lateral surface with several granules sub-paralleling extensor margin on P2–4; fleXor margin with small distal spine. Propodi 7.7–8.2 (P2–3)–6.0 (P4) times as long as broad; eXtensor margin unarmed; fleXor margin with 5–8 slender movable spines on P2–4. Dactyli slender, length 0.9–1.1 that of propodi; fleXor margin with 4 movable spinules, distal third unarmed, without a spinule at the base of the unguis; P2 dactylus 9.5 times as long as wide.

COLOUR. Ground colour of carapace and abdominal somites 2–3 reddish or pinkish; abdominal somites 4–6 and tailfan whitish. Rostrum and supraocular spines reddish. P1 pinkish or reddish, fingers whitish. P2–4 pinkish, distal part of propodi and dactyli whitish.

GENETIC DATA. COI, see Table 1 .

Remarks

Munida hoda sp. nov. resembles M. africana Balss, 1913 , from the east coast of Africa ( Macpherson 1991), by the presence of 5 spines on the branchial lateral margins of the carapace, spines along the anterior ridge of the second abdominal somite, large eyes and distomesial spine of the antennular article 1 shorter than the distolateral spine. They differ in several aspects:

- The supraocular spines do not reach the end of the corneae in M. hoda sp. nov., whereas they exceed the corneae in M. africana .

- The P2–4 dactyli have 4 spines on the median portion of the fleXor margin in M. hoda sp. nov., whereas they have 9 spines along the entire fleXor margin in M. africana .

Only a short fragment of 320 base pairs could be sequenced for COI. Based on this fragment, the most similar species was M. benguela from the SW Indian Ocean and SE Atlantic Ocean (3.2%), while values with respect to other species such as M. congesta Macpherson, 1999 , M. rosula Macpherson, 1994 or M. eclepsis Macpherson, 1994 , from New Caledonia and adjacent waters ( Macpherson 1994, 1999), were between 3.8 and 5.5%.

Munida hoda sp. nov. and M. benguela also belong to the group of species with 5 spines on the branchial lateral margins of the carapace, spines along the anterior ridge of the second abdominal somite, large eyes and the distomesial spine of the antennular article 1 shorter than the distolateral spine. The two species are easily distinguished by some aspects:

- The anterior ridge of the somite 2 with one uninterrupted transverse ridge on the tergite behind the anterior ridge in M. hoda sp. nov., whereas there are 3–4 uninterrupted transverse ridges in M. benguela . - The P2–4 dactyli have spines on the median portion of the fleXor margin in M. hoda sp. nov., whereas they have spines along the entire fleXor margin in M. benguela . Furthermore, the dactyli are longer and more slender in M. hoda sp. nov. than in M. benguela .

Distribution

Mozambique, between 630 and 715 m.

Figures

Fig. 5. Munida hoda sp. nov., holotype, ♂, 5.3 mm (MNHN-IU-2014-13479), Mozambique. A. Carapace and abdomen, dorsal view. B. Sternal plastron. C. Cephalic region, showing antennular and antennal peduncles, ventral view. D. Right Mxp3, lateral view. E. Right P1, dorsal view. F. Right P2, lateral view. G. Dactylus of right P2, lateral view. H. Left P3, lateral view. I. Left P4, lateral view. Scale bar: A, E–F, H–I = 1.0 mm; B–D, G = 0.5 mm.

Fig. 11. Dorsal view. Colours in life. A. Munida africana Balss, 1913, ♀, 10.9 mm, Mozambique, MAINBAZA, Stn CP3141. B. Munida benguela de Saint-Laurent & Macpherson, 1988, ♂, 20.0 mm, Mozambique, MAINBAZA, Stn CP3138. C. Munida benguela de Saint-Laurent & Macpherson, 1988, ♀, 13.7 mm, Mozambique, MAINBAZA, Stn CP3135. D. Munida hoda sp. nov., paratype, ov. ♀, 11.4 mm, Mozambique, MAINBAZA, Stn CC3166.