Laspionchis bourkei lateriensis Dayrat & Goulding

Dayrat, Benoit, Goulding, Tricia C., Khalil, Munawar, Comendador, Joseph, Xuan, Qu ảng Ngo, Tan, Siong Kiat & Tan, Shau Hwai, 2019, A new genus of air-breathing marine slugs from South-East Asia (Gastropoda, Pulmonata, Onchidiidae), ZooKeys 877, pp. 31-80 : 60-63

Laspionchis bourkei lateriensis Dayrat & Goulding ssp. nov. Figs 17E , 18E, F, I , 19D , 21B , 22B , 23 A–D , 24E, G , 25

Holotype.

INDONESIA • holotype, designated here, 17/16 mm [6064 H]; Ambon, Lateri; 03°38.261'S, 128°14.716'E; 12 Feb. 2014; M Khalil and party leg.; st 128, mudflat next to small creek in the low intertidal of mangrove preserve; UMIZ 00115.

Additional material examined.

INDONESIA - Ambon • 5 specimens 12/7 mm [2743], 17/10 mm [2753], 15/12 mm [6061], 18/13 mm [6063], 15/12 mm [6065]; same collection data as for the holotype; UMIZ 00116.

Distribution

( Fig. 7 ). Indonesia (Ambon).

Habitat

( Fig. 17E ). Same as the entire species Laspionchis bourkei (see above).

Etymology.

The subspecies Laspionchis bourkei lateriensis is named after Lateri, in Ambon because the type locality is part of the preserved mangrove of Lateri. The name lateriensis is an adjective derived from Lateri and the suffix - ensis.

Diagnosis

(Table 3 ). Externally, the three subspecies of L. bourkei cannot be distinguished. Internally, L. bourkei lateriensis differs from L. bourkei bourkei but cannot be distinguished from L. bourkei matangensis . All three subspecies, however, are clearly delineated using molecular DNA sequences.

Color and morphology of live animals

( Fig. 18E, F, I ). Identical to the species L. bourkei (see above).

Digestive system

( Figs 19D , 25 ). Identical to the species L. bourkei (see above). Examples of radular formulae are presented in Table 4 . Radulae measure up to 1.7 mm in length.

Reproductive system

( Fig. 21B ). Identical to the species L. bourkei (see above).

Copulatory apparatus

( Figs 22B , 23 A–D , 24E, G ). Similar to the species L. bourkei (see above) acknowledging some minor variations: the length of the spine of the accessory penial gland ranges from 0.35 mm [6063] (UMIZ 00116) to 0.75 mm [6064 H] (UMIZ 00115), the retractor muscle is vestigial or absent, and penial hooks measure from 20 to 45 μm.

Remarks.

See above, the remarks on the species Laspionchis bourkei .

Figures

Figure 7. Geographical distribution of the two species of Laspionchis. Distinct colors are used for each subspecies of L. bourkei. The colors used are the same as those used in the phylogenetic trees (Figs 2 - 5). Colored areas correspond to hypothetical geographical ranges based on known records.

Figure 17. Habitats, Laspionchis bourkei A-D L. bourkei bourkei Australia, Northern Territory E L. bourkei lateriensis, Indonesia, Ambon. A Avicennia on sandy mud (st 61, type locality) B same as A C large Sonneratia alba, open forest, soft mud by shore (st 62) D Sonneratia, Rhizophora, and Ceriops mangrove (st 66) E mudflat beside a mangrove and a creek (st 128, type locality).

Figure 18. Live animals, Laspionchis bourkei A-D, G, H L. bourkei bourkei Australia, Northern Territory E, F, I L. bourkei lateriensis, Indonesia, Ambon. A Dorsal view, 20 mm long [1618] (NTM P. 57617) B dorsal view, 21 mm long [1656] (NTM P. 57617) C holotype, dorsal view, 23 mm long [1657 H] (NTM P. 57615) D dorsal view, 19 mm long [1673] (NTM P. 57618) E dorsal view, 12 mm long [2743] (UMIZ 00116) F dorsal view, 17 mm long [2753] (UMIZ 00116) G ventral view, 19 mm long [1659] (NTM P. 57618) H ventral view, 23 mm long [1617] (NTM P. 57617) I ventral view, same as E.

Figure 19. Digestive system, dorsal view, Laspionchis bourkei A-C L. bourkei bourkei, Australia, Northern Territory D Holotype, L. bourkei lateriensis, Indonesia, Ambon E, F L. bourkei matangensis, Peninsular Malaysia. A [1673] (NTM P. 57618) B [1666] (NTM P. 57618) C [1693] (NTM P. 57619) D [6064 H] (UMIZ 00115) E [5959] (USMMC 00056) F holotype, [5958 H] (USMMC 00055). Scale bars: 2 mm (A, C-E), 2.5 mm (B), 1 mm (F). Abbreviations: ddg dorsal digestive gland i intestine pdg posterior digestive gland r rectum st stomach.

Figure 21. Posterior, hermaphroditic (female) reproductive system, Laspionchis bourkei. A Holotype, L. bourkei bourkei, Australia, Northern Territory, [1657 H] (NTM P. 57615) B holotype, L. bourkei lateriensis, Indonesia, Ambon, [6064 H] (UMIZ 00115) C holotype, L. bourkei matangensis, Peninsular Malaysia, [5958 H] (USMMC 00055). Scale bars: 2 mm (A), 1 mm (B, C). Abbreviations: dd deferent duct fgm female gland mass hg hermaphroditic gland ov oviduct rs receptaculum seminis sp spermatheca.

Figure 22. Anterior, male, copulatory apparatus, Laspionchis bourkei. A Holotype, L. bourkei bourkei, Australia, Northern Territory, [1657 H] (NTM P. 57615) B holotype, L. bourkei lateriensis, Indonesia, Ambon, [6064 H] (UMIZ 00115) C holotype, L. bourkei matangensis, Peninsular Malaysia, [5958 H] (USMMC 00055). Scale bars: 1 mm (A), 2 mm (B), 0.5 mm (C). Abbreviations: ag accessory penial gland dd deferent duct ms muscular sac ps penial sheath rm retractor muscle v vestibule.

Figure 23. Penial hooks, Laspionchis bourkei A-D Holotype, L. bourkei lateriensis, Indonesia, Ambon [6064 H] (UMIZ 00115) E, F L. bourkei bourkei, Australia, Northern Territory [1692] (NTM P. 57619). Scale bars: 40 μm (A, E), 20 μm (B), 5 μm (C, D), 4 μm (F).

Figure 24. Spine of the accessory penial gland, Laspionchis bourkei A-D, F L. bourkei bourkei, Australia, Northern Territory E, G L. bourkei lateriensis, Indonesia, Ambon. A Holotype, [1657 H] (NTM P. 57615) B [1666] (NTM P. 57618) C [1692] (NTM P. 57619) D [1673] (NTM P. 57618) E holotype, [6064 H] (UMIZ 00115) F same as A G same as E. Scale bars: 100 μm (A-E), 10 μm (F, G).

Figure 25. Radula, Laspionchis bourkei lateriensis, Indonesia, Ambon A-D holotype [6064 H] (UMIZ 00115) E, F [6063] (UMIZ 00116). A Rachidian and innermost lateral teeth B rachidian and innermost lateral teeth C lateral teeth D lateral teeth E lateral teeth (inferior view) F outermost lateral teeth. Scale bars: 10 μm (A, F), 20 μm (B, C), 30 μm (D), 8 μm (E). Abbreviations: bls basal lateral spine hlt hook of a lateral tooth.