Scutigerellidae

Camacho, Miguel Domínguez, 2010, New insights on the genus Scolopendrelloides Bagnall 1913 (Scutigerellidae, Symphyla) with descriptions of two new species, Zootaxa 2558, pp. 48-60 : 58-59

Key to the genera of Scutigerellidae using SEM

A new determination key to the genera of the family Scutigerellidae is proposed here, which is mainly intended for observations using SEM. Accordingly, features which are easily observed at a first glance are considered first. Before using this key it is important to take it into account the aforementioned exceptions with some Hanseniella species above mentioned, such as H. imerina , H. remy , H. modesta and H. incisa .

1. Cuticle of the tergites pubescent ( Fig. 6 B, C)............................................................................................................... 2

- Cuticle of the tergites glabrous ( Fig. 6 A, 5) ................................................................................................................. 5

2. Anterior tergites convex porsteriorly, with antero-lateral macrochaetae prominent, usually long. Head rounded, as broad as long or broader than long. Central rod posteriorly ends in a knob in the middle of the head ( Fig. 6 B) ........ 3

- Anterior tergites not convex posteriorly; with posterior margins straight, emarginated or bilobed, and with antero- lateral macrochaetae not very prominent. Head a bit longer than broad ...................................................................... 4

3. Anterior tergites with two postero-lateral rounded lobes separated by a median indentation and posterior margins

crenate. Head somewhat rounded ................................................................................................... Scopoliella Scheller - Anterior tergites straight, emarginated or bilobed, without crenate posterior margins. Head heart-shaped ( Fig. 6 C)... .......................................................................................................................................................... Scutigerella Ryder

4. Medioventral process (or processes) present between each pair of coxal sacs belonging to legs 5–9........................... ......................................................................................................................................................... Millotellina Jupeau

- No such medioventral processes present between the coxal sacs .................................................. Hanseniella Bagnall

5. Tergites emarginated posteriorly. Head heart-shaped, a bit longer than broad. ( Fig. 6 A) .. Scolopendrelloides Bagnall

- Anterior tergites convex posteriorly. Head somewhat rounded, about as broad as long ( Fig. 5 ) .. Hanseniella Bagnall

Figures

FIGURE 5. Head and first trunk tergites of Hanseniella capensis (museum specimen MNHN 2567) (A) and Hanseniella nivea (a freshly collected specimen from Slovenia (B), with details of the cuticle on the tergites (below). Scale bars = 100 μm.

FIGURE 6. Head and first trunk tergites of Scolopendrelloides congolensis (A), Hanseniella cf. caldaria (B) and Scutigerella causeyae (C). Numbers indicate the characters mentioned in table 1. Below it is shown details of the cuticle of the third tergite in Scolopendrelloides congolensis (D, E), Hanseniella cf. caldaria (F), Hanseniella agilis (G), Scutigerella causeyae (H) and Scutigerella immaculata (I). Scale bars = 100 μm.