Munida jurunjurun McCallum, Ahyong & Andreakis, 2021, sp. nov.
Creators: name: McCallum, Anna W.
name: Ahyong, Shane T.
name: Andreakis, Nikos
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Munididae
Munida
Munida jurunjurun

description: Munida jurunjurun sp. nov.   
http://zoobank.org/urn:lsid:zoobank.org:act:CD77DA72-B760-  
4983-9252-6BC62CC7CE50  
Figures 8, 9  
 Type material. Holotype: WAM C78561, ovigerous female (cl 14.7 mm, pcl 9 mm), Western Australia, off Imperieuse Reef, 17° 35.982' S, 118° 59.076'E to 17° 38.574'S, 119° 01.26'E, 222–319 m, SS05/2007/63, 16 June 2007.   
 Description. Carapace. Length 1.1 × greatest width, widest at midlength. Dorsal surface with numerous uninterrupted transverse ridges and secondary transverse striae between main ridges; ridges and striae lined with short, non-iridescent setae. Gastric region with 5 pairs of epigastric spines, longest pair behind supraocular spines. Parahepatic, postcervical and dorsal branchial spine present. Anterior part of branchial region between cervical groove and postcervical groove with 3 main ridges; posterior part of branchial region with 6 main transverse ridges (excluding posterodorsal ridge) and 5 secondary striae laterally between main ridges. Cardiac region with 5 main transverse ridges. Intestinal region with transverse ridge, posterodorsal ridge and secondary stria. Frontal margin inclined posteriorly at 112° from midline. Lateral margins slightly convex; anterolateral spines parallel, horizontal, overreaching sinus between rostrum and supraocular spine; small hepatic marginal spine in front of cervical groove (0.15 × length of anterolateral spine); branchial margin with 4 spines. Rostrum spiniform, horizontal, 0.7 × pcl; supraocular spine 0.5 × length of rostrum. Epistomial ridge straight ending slightly anterior to antennal gland; mesial protuberance distinct.   
Thoracic sternum. Sternal surface smooth, sternite 4 with few short striae. Sternite 3 0.4 width of sternite 4; midlength of sternal plastron (sternites 4–7) 0.5 width of sternite 7. Sternite 4 anterior margin broadly rounded.  
Abdomen. Somite 2 with 2 pairs of small spines at lateral margins of anterior transverse ridge. Somites 2–4 each with 2 or 3 uninterrupted striae behind anterior ridge and some shorter striae. Somite 6 posteromedian margin almost straight. Telson with numerous transverse squamae; greatest width 2.0 × median length; anterolateral margin almost straight or shallowly concave.  
Eye. Maximum corneal diameter 0.36 × distance between anterolateral spines.  
Antennule. Basal article (distal spines excluded) overreaching or reaching end of corneae; 2 well-developed distal spines, distomesial slightly longer than distolateral; 2 lateral spines, proximal small, distolateral spine exceeding both distal spines.  
Antenna. Article 1 with strong distomesial spine overreaching distal margin of article 4. Article 2 with strong distomesial spine overreaching distal margin of article 4; distolateral spine reaching distal margin of article 4; 2 small lateral spines on mesial margin. Articles 3 and 4 unarmed.  
Maxilliped 3. Ischium 1.45 × merus length, with strong flexor distal spine; merus with strong spine on flexor margin and small spine distally, with small spine on distal extensor margin.  
P1. length 3.0 × pcl, with iridescent setae on inner margin. Merus 1.25 × pcl, with a row of 5 dorsal spines and row of 5 long, close set spines on mesial margin; distal spines strong, distomesial spine not reaching midlength of carpus. Carpus 0.4 × merus length, length 2.6 × width, with spines along mesial and dorsal margins. Propodus 1.1 × merus length, fingers 0.5 × total propodus length, with 2 small distolateral spines; dactylus with small proximal spine small subdistal spine.  
P2–4. Long and slender, with numerous scales on lateral surfaces of meri; margins with row of plumose setae and iridescent setae on ischium and merus. P2 length 2.6 × pcl; merus as long as pcl, length 6 × height, 4.0 × carpus length and 1.2 × propodus length, extensor margin spinose, flexor margin with small spine near distal one-fifth and well-developed distal spine; carpus extensor margin with 3 small spines (broken on right P2 of the holotype) and prominent distal spine, flexor margin with distal spine; propodus length 9.3 × height, with 11 small movable flexor spines; dactylus compressed, slightly curved, length 0.5 × propodus length and 5 × height, with 10 evenly spaced spines along distal 0.8 of flexor margin. End of P2 carpus reaching end of P1 merus. P3 with similar spination and article proportions as P2; merus slightly shorter than P2 merus (0.85); propodus and dactylus as long as those of P2. P4 length 0.9 × P2 length; merus 0.7 × pcl, 0.8 × P3 merus length; propodus 0.85 and dactylus 0.95 × length of those of P3; merocarpal articulation slightly overreaching anterolateral corner of carapace.  
 Genetic data. COI and 16S; see Table 1.   
 Etymology. Named jurunjurun with the approval of Bardi elders, after Jurun jurun, meaning crayfish in Bardi; used as a noun in apposition.   
 Remarks. Munida jurunjurun sp. nov. is closest to M. acantha Macpherson, 1994, from New Caledonia, both species having antennal articles 1 and 2 with long mesial spines overreaching article 4, antennule with distomesial spine longer than distolateral spine, a smooth thoracic sternum, and abdominal somite 2 with small spines limited to the lateral margins of the anterior ridge. The new species differs from M. acantha in having 4 rather than 5 branchial carapace spines. In addition, the new species has a distinct row of spines on the mesial margin of the P1 merus, which are close-set on the distal half of the article, rather than more evenly spaced along the distal 0.6 as in M. acantha. Sequence divergence between M. acantha and M. jurunjurun sp. nov. is 8% for COI and 3.5% for 16S.   
 Of those species with 4 branchial spines, M. jurunjurun sp. nov. is similar to M. albiapicula Baba and Yu, 1987, M. zebra Macpherson, 1994, M. volantis Macpherson, 2004, and M. nesiotes Macpherson, 1999, all of which have a long mesial spine on antennal articles 1 and 2. In these species, however, the spines on the anterior ridge of abdominal somite 2 are evenly spread along the entire margin, rather than placed at the lateral extremities.   
 Distribution. North-western Australia, off Imperieuse Reef, 222–319 m
description: Published as part of McCallum, Anna W., Ahyong, Shane T. & Andreakis, Nikos, 2021, New species of squat lobsters of the genus Munida from Australia, pp. 113-152 in Memoirs of Museum Victoria 80 on pages 125-127, DOI: 10.24199/j.mmv.2021.80.06, http://zenodo.org/record/12214129