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Phytobia (Dizygomyza) spinata Groschke, 1954. Dt. ent. Z. 1: 145
Cerodontha (Dizygomyza) spinata (Groschke, 1954); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 351, 352
Cerodontha spinata (Groschke, 1954); Gibbs, 2002. Dipterists Digest 9: 154.

Leaf-miner: Upper surface mine that finishes in the leaf sheath. Mine changes direction at least twice. Frass in one large lump. Pupation in the mine, usually in the leaf sheath (Bladmineerders van Europa).

Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.

The larva is described by Nowakowski (1973). The larval thorax has both ventrally and dorsally, sometimes paired, protuberances. In this species the paired projections of the pronotum in the puparial stage penetrate the wall of the puparium as two conspicuous spines (Bladmineerders van Europa).

Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).

Posterior spiracles each with three, extended bulbs (Bladmineerders van Europa).

Hosts in Great Britain and Ireland:

Cyperaceae
Carex	sylvatica	Wood-sedge		Gibbs, 2002: 154

Hosts elsewhere:

Cyperaceae
Carex	pilosa			Bladmineerders van Europa
Carex	pilosa			Spencer, 1990: 352
Carex	sylvatica	Wood-sedge		Bladmineerders van Europa
Carex	sylvatica	Wood-sedge		Spencer, 1990: 352

Time of year - larvae: March-June (Bladmineerders van Europa).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Somerset (Folly Farm) (Gibbs, 2002: 154) and Gloucestershire (Gibbs, 2003b); North Somerset (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Poland (Spencer, 1990: 352), Austria, Czech Republic and Germany (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.