New genus and two new species of driftwood hoppers (Crustacea, Amphipoda, Talitridae) from northeast Atlantic and Mediterranean coastal regions Author Wildish, David J. text Zoosystematics and Evolution 2014 90 2 133 146 http://dx.doi.org/10.3897/zse.90.8410 journal article http://dx.doi.org/10.3897/zse.90.8410 1860-0743-2 D1D134DB-3E05-4434-9327-7BF90A912982 Taxon classification Animalia Amphipoda Talitridae Neotenorchestia gen. n. Neotenorchestia : Wildish et al. 2012 ; Pavesi et al. (2014) , as unknown taxon. Type species. Neotenorchestia kenwildishi gen. sp. n. n. Component species. Monotypic. Diagnosis. As in Orchestia and specifically similar to Orchestia mediterranea A. Costa 1853 except for: - lack of dorsal pigment patterns (versus dorsal pigment patterns in Orchestia mediterranea as in Wildish, 1987). - smaller size by neoteny (largest total body length estimated to be 12 to16 mm, versus up to 20 mm in Orchestia mediterranea ) Very similar to Orchestia mediterranea A. Costa 1853 and if characterization is limited to conventional morphological methods this species can easily be misidentified as a juvenile O. mediterranea. The use of relative growth methods and regression fitting predictions as found in Pavesi et al. (2014 , see Table 3) are required for definitive identification. Etymology. Refers to the origin of the new genus by a form of neoteny and combination of the stem of this word with the genus Orchestia to which it is closely related. Figure 4. Neotenorchestia kenwildishi gen. n., sp. n. Habitus of juvenile paratype, total body length (TBL) = 3.7 mm. All other body parts from immature male holotype, TBL = 7.2 mm. Antennae and pleopod scale = 0.25 mm. Mouthparts, scale = 0.1 mm. Figure 5. Neotenorchestia kenwildishi gen. n., sp. n. Immature male holotype as in Fig. 3, except peraeopod 3 is from a female paratype of TBL = 8.3 mm. Scale = 0.25 mm. Table 3. Summary of morphological and molecular data available for species of Macarorchestia . * Stock (1989) , ** Wildish et al. (2012) .

Species	Lmnd lacinia mobilis dentition	Numbers of setae in tufts on male propodus of P7 Distal Anterodistal	Number of tufts on posterior side of male propodus of P7	Mt DNA COI**
Macarorchestia microphtalma	4	6 0	4	?
Macarorchestia roffensis	4	2 0	0	Yes
Macarorchestia martini	5*	??	?	Yes
Macarorchestia remyi	4-5	6 2	3	Yes
M. pavesiae sp. n.	4	6 2	3	Yes