Gonodactylopsis maqqaba, 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 : 54-56

Gonodactylopsis maqqaba sp. nov.

urn:lsid:zoobank.org:act:D5F0BAF8-8CED-4A3A-86CB-5F2B0B189281

Figs 1, 9

Holotype: NTOU S00036 , female (TL 16 mm), Macclesfield Bank , South China Sea, 16°10.06'N 114°47.93'E, 30 m, coral reef, inside coral rock, RV “Ocean Researcher 1”, ZHONGSHA 2015 cruise, 28 July 2015.

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

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

Rostral plate slightly wider than long; median spine about twice length of basal portion (medially), laterally compressed, with obtusely angular ventral keel; lateral spines divergent with 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-segmented. Maxillipeds 1–5 each with epipod.

Thoracic somites 6 and 7 lateral processes subequal, lower margins subtruncate to rounded. Thoracic somite 8 anterolateral margin rounded; sternal keel obsolete.

Abdominal somites 1–5 posterolateral angles unarmed. AWCLI 773. Abdominal somite 6 with submedian, intermediate and lateral bosses posteriorly armed.

Telson wider than long; 12 or 13 submedian denticles arising from inner margin of submedian teeth; 2 intermediate and 1 lateral denticles; submedian and intermediate teeth slender, sharp; submedian teeth slightly divergent; intermediate teeth length at least twice width, extending posteriorly to midlength of submedian teeth; lateral teeth stout, triangular, apex acute, directed posteriorly. Median carina weakly inflated, with 1 large posterior spine and 2 smaller dorsally; accessory median carina with 2 spines; anterior submedian carina composed of 5 or 6 spines in longitudinal cluster; submedian tooth with 6 dorsal spines distributed from base almost to end of tooth; anterior intermediate carina composed of 2 spines; intermediate tooth with 1 dorsal spine; knob absent; submedian and intermediate teeth with distinct 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 dorsal carina; slender spine above exopod articulation. Exopod proximal article dorsal surface with sharp, curved longitudinal carina and two short carinae mesial to main carina, distal longest; outer margin with 10 or 11 movable spines, distalmost reaching distal one-fifth 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 membranous, soft, wrinkled, clearly demarcated from chitinized outer half; outer chitinized portion with prominent, curved carina dorsally, ventrally smooth. Endopod length 2.4× width, linear, spatulate, articulation with protopod at anterior end; outer margin gently convex, setose along distal half, inner margin almost straight glabrous, with small proximal and distal point; dorsally with sharp, curved carina adjacent to outer margin; dorsal and ventral surfaces with inner half membranous, soft, wrinkled, clearly demarcated from chitinized outer half.

Colouration in preservative. Largely faded to pale yellowbrown. Carapace with scattered chromatophores and pair of small spots across cervical region. Thoracic somite 6 and abdominal somite 1 with rectangular field of small irregular chromatophores and larger median black spot. Abdominal somites 2–5 with transverse row of 2 or 3 small rounded spots.

Measurements. TL 16 mm, CL 3.8 mm, antennular peduncle length 1.9 mm, antennal scale length 1.3 mm, abdominal somite 5 width 2.9 mm.

Etymology. The name is derived from maqqaba, Aramaic for hammer, alluding to the “smashing” mode of raptorial hunting employed by the species. Used as a noun in apposition.

Remarks. Gonodactylopsis maqqaba sp. nov. closely resembles G. drepanophora in similar telson ornamentation, in which the mid-dorsal carinae are composed of multiple prominent conical spines, the intermediate primary teeth are slender with a pointed apex, and the lateral primary tooth is prominently triangular with a pointed apex ( Figs 3E,I , 4F , 9H ). The two species differ chiefly in the shape of the uropodal endopod, being spatulate with a more-or-less straight mesial margin in G. maqqaba (versus lunate with a distinctly concave mesial margin in G. drepanophora ) and in the position of the articulation with the protopod, being at the proximal end in G. maqqaba (rather than distal to the anterior end in G. drepanophora ). In addition, in size-matched specimens the submedian teeth of the telson are dorsally spinose only on the anterior half in G. drepanophora , rather than along almost the full length in G. maqqaba . The telson armature observed in G. drepanophora (as with other spinose gonodactylids; Ahyong, 2001; Ahyong & Erdmann, 2007; Ahyong, 2008) becomes more extensive and prominent with increasing body size. At TL 16 mm, the submedian telson teeth of the holotype of G. maqqaba are spinose for almost their full length. The submedian telson teeth in similarlysized G. drepanophora , however, reach a similar degree of spination to that of the holotype of G. maqqaba only by TL 24 mm; by TL 16 mm, spination is yet to reach the midlength of the submedian teeth. Thus, the degree of spination of the submedian telson teeth can be useful in separating G. maqqaba from G. drepanophora provided body size is taken into account.

Distribution. South China Sea, from Macclesfield Bank; 30 m.

ACKNOWLEDGEMENTS. Thanks go to Tin-Yam Chan (NTOU) for the colour image of G. lata , the opportunity to study the holotype of G. maqqaba , and hospitality in Taiwan; M. K. Moosa for access to the LIPI collection; Rafael Lemaitre and Karen Reed (both USNM) for hospitality in Washington D.C.; Andrew Hosie (WAM), Paul Clark and Miranda Lowe (both NHM); Laure Corbari, Paula Martin-Lefèvre and the late Alain Crosnier (all MNHN) for their hospitality in Paris; Daisy Wowor (MZB) for curatorial assistance; Andreas Allspach and the late Michael Türkay (SMF) for the loan of material in their care; and Mark Erdmann for collecting specimens of G. komodoensis examined here. The late Lilly King Manning is thanked for drafting Figure 4K . Thanks are due to Laure Corbari, Anouchka Sato, Gary Poore and Zdenek Ďuriš for their good cheer in Kavieng. Peter Ng and anonymous reviewer are thanked for their constructive comments on the manuscript. The Kavieng Lagoon Biodiversity Survey (Principal Investigators: Philippe Bouchet, Jeff Kinch) was part of the Our Planet Reviewed expeditions organized jointly by Muséum National d’Histoire Naturelle (MNHN), Pro-Natura International (PNI) and Institut de Recherche pour le Développement (IRD), with support from Papua New Guinea’s National Fisheries Authority. The organizers acknowledge supporting funding from the Total Foundation, the Laboratoire d’Excellence Diversités Biologiques et Culturelles (LabEx BCDiv), the Laboratoire d’Excellence Diversités Biologiques et Culturelles (LabEx BCDiv, ANR-10- LABX-0003-BCDiv), the Programme Investissement d’Avenir (ANR-11-IDEX-0004-02), the Fonds Pacifique, and CNRS Institut Ecologie et Environnement (INEE). The expedition was endorsed by the New Ireland Provincial Administration and operated under a Memorandum of Understanding with University of Papua New Guinea (UPNG).This is a contribution from the Australian Museum Research Institute.

Figures

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 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.